问题
I am using the Elmah Logged event in my Global.asax file to transfer users to a feedback form when an unhandled exception occurs.
Sometimes I log other handled exceptions. For example:
ErrorSignal.FromCurrentContext().Raise(new System.ApplicationException("Program code not found: " + Student.MostRecentApplication.ProgramCode));
// more code that should execute after logging this exception
The problem I am having is that the Logged event gets fired for both unhandled and these handled, raised exceptions. Is there a way to determine, in the Logged event handler, whether the exception was raised via ErrorSignal class or was simply unhandled? Are there other Elmah events that I can take advantage of?
回答1:
Tired of trying to find the "right" way to do this, so I ended up creating my own exception type:
public class HandledElmahException : Exception
{
public HandledElmahException() : base() { }
public HandledElmahException(string message) : base(message) { }
public HandledElmahException(string message, Exception innerException) : base(message, innerException) { }
}
Then, in the ErrorLog.Logged event handler I just check to see if the exception is of type HandledElmahException
.
void ErrorLog_Logged(object sender, ErrorLoggedEventArgs args)
{
if (args.Entry.Error.Exception is HandledElmahException)
return;
// my code to transfer to custom error page to collect feedback...
}
So, if I don't want to take them to the ErrorPage, when an exception is logged, I use an instance of my special HandledElmahException
class, which can be derived from.
ErrorSignal.FromCurrentContext().Raise(new HandledElmahException("Program code not found: " + Student.MostRecentApplication.ProgramCode));
来源:https://stackoverflow.com/questions/2905396/need-to-determine-if-elmah-is-logging-an-unhandled-exception-or-one-raised-by-er